Writing instrument



FIG. 1 is a left side perspective view taken from the front and above showing our new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is right side elevational view, the left side being a mirror image thereof. 

The ornamental design for a “writing instrument,” as shown and described. 